Boyfriend wants to wear my underwear?

Sooo recently I ended up catching him wearing a pair, he told me he wants to start wearing them all the time. I find it very odd, he swears that they're the most comfortable he's ever worn but to me they don't look comfortable on him. It's also a major turn off but I also feel wrong telling him what to do in this regard

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I completely put this in the wrong place, I'm sorry!
Boyfriend wants to wear my underwear?
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